Forma, Vol. 8 (No. 3), pp. 309-314, 1993
Original Paper

Pattern Formation on Polymer Surface

Shinichi Sakurai, Norihiro Tameno and Shunji Nomura

Department of Polymer Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606, Japan

(Received July 29, 1993; Accepted October 28, 1993)

Keywords: Surface Pattern, Polymer Surface, Block Copolymer, Concentric Ring, Solvent Evaporation

Abstract. We present a peculiar undulation pattern on a polymer surface of a poly (styrene-block-butadiene-block-styrene) triblock copolymer, which was dissolved in toluene and then cast on a plate kept at 50°C. The pattern showed a series of concentric rings in a cellular compartment. We discuss the effects of size and shape of a preparation dish, using circular petri dishes, doughnut shape (between two co-axial circular petri dishes), triangle and square dishes. It was found that the concentric ring pattern was obtained only in the dish having a round shape of a side wall. As for the size effect, no foundamental difference in the pattern was observed between 8 and 12 cm diameter circular petri dishes.